The Train Hostel Hokutosei, pictured, is located in Tokyo's Nihonbashi business district and fashioned from a retired train

The Hokutosei sleeper train, which operated between Tokyo and Sapporo for 27 years until 2015, was converted into a facility that can sleep up to 78 guests, with two private cabins, one pictured

Facilities at the quirky new hostel include a shared kitchen, equipped so that guests can cook their own food, pictured

It opened in December in a seven-storey building and still has many of its original fixtures, including these fold-out seats

One floor is reserved for women only, and the other three levels are mixed, with guests sleeping in these stacked beds

A receptionist welcomes guests to the hostel, which is cheap and cheery but bans children under the age of four from staying

Located in the heart of a business district above JR Bakurocho Station, it's just five minutes away by train to Tokyo Station

Two guests tuck into a meal in Hokutosei's communal lounge area, which looks much the same as it did on the sleeper train

When assembled as seats, the beds boast plush head rests and arm rests, as well being located under cosy lamps and next to power points

For the purposes of a good night's sleep, the seats fold down flat into beds and still have straps to secure passengers during bumpy train rides

More basic cabins have paired down versions of the bunks, with a little less space to stretch out, but they still have curtains for privacy 

Colour schemes vary across the hostel's levels, with palettes of dark red, faded pink and baby blue, pictured here

Located on the top floor of the building, facilities include washing machines and dryers for guests to use during their stay

Bathrooms, also on the top floor, are available for shared use, featuring basic wash basins, showers, mirrors and power points

The lounge is equipped with tables and chairs that were used in the retired sleeper's dining room, and displays a snowy image of the train during its service